I am currently trying to interface a simple matrix keypad with my z-uno. I see that z-uno comes with a ZMEKeypad.h library and example and I am able to write a small program with it that compiles just fine (although it doesn't seem to work for me - I haven't looked into why yet).
I was hoping to use the keypad library that is provided in the Arduino IDE library manager (by Mark Stanley and Alexander Brevig). This is just because I am more familiar with it. When I start my code with

We can check it but Arduino library do not account for Z-Uno specific features. We have also noticed recently that our ZMEKeypad is not well optimized and causes problems. This is why we have already improved it abd we will release this with 2.1.5 soon. If you can wait one-two weeks, we will update the lib